US20100331791A1 - Drug delivery device with dose dial sleeve rotational stop - Google Patents
Drug delivery device with dose dial sleeve rotational stop Download PDFInfo
- Publication number
- US20100331791A1 US20100331791A1 US12/788,767 US78876710A US2010331791A1 US 20100331791 A1 US20100331791 A1 US 20100331791A1 US 78876710 A US78876710 A US 78876710A US 2010331791 A1 US2010331791 A1 US 2010331791A1
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- United States
- Prior art keywords
- dial sleeve
- rotational stop
- dose
- inner housing
- helical groove
- Prior art date
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
- A61M5/00—Devices for bringing media into the body in a subcutaneous, intra-vascular or intramuscular way; Accessories therefor, e.g. filling or cleaning devices, arm-rests
- A61M5/178—Syringes
- A61M5/31—Details
- A61M5/315—Pistons; Piston-rods; Guiding, blocking or restricting the movement of the rod or piston; Appliances on the rod for facilitating dosing ; Dosing mechanisms
- A61M5/31533—Dosing mechanisms, i.e. setting a dose
- A61M5/31545—Setting modes for dosing
- A61M5/31548—Mechanically operated dose setting member
- A61M5/3155—Mechanically operated dose setting member by rotational movement of dose setting member, e.g. during setting or filling of a syringe
- A61M5/31551—Mechanically operated dose setting member by rotational movement of dose setting member, e.g. during setting or filling of a syringe including axial movement of dose setting member
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
- A61M5/00—Devices for bringing media into the body in a subcutaneous, intra-vascular or intramuscular way; Accessories therefor, e.g. filling or cleaning devices, arm-rests
- A61M5/178—Syringes
- A61M5/24—Ampoule syringes, i.e. syringes with needle for use in combination with replaceable ampoules or carpules, e.g. automatic
- A61M2005/2403—Ampoule inserted into the ampoule holder
- A61M2005/2407—Ampoule inserted into the ampoule holder from the rear
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
- A61M5/00—Devices for bringing media into the body in a subcutaneous, intra-vascular or intramuscular way; Accessories therefor, e.g. filling or cleaning devices, arm-rests
- A61M5/178—Syringes
- A61M5/31—Details
- A61M2005/3103—Leak prevention means for distal end of syringes, i.e. syringe end for mounting a needle
- A61M2005/3104—Caps for syringes without needle
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
- A61M5/00—Devices for bringing media into the body in a subcutaneous, intra-vascular or intramuscular way; Accessories therefor, e.g. filling or cleaning devices, arm-rests
- A61M5/178—Syringes
- A61M5/24—Ampoule syringes, i.e. syringes with needle for use in combination with replaceable ampoules or carpules, e.g. automatic
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
- A61M5/00—Devices for bringing media into the body in a subcutaneous, intra-vascular or intramuscular way; Accessories therefor, e.g. filling or cleaning devices, arm-rests
- A61M5/178—Syringes
- A61M5/31—Details
- A61M5/315—Pistons; Piston-rods; Guiding, blocking or restricting the movement of the rod or piston; Appliances on the rod for facilitating dosing ; Dosing mechanisms
- A61M5/31533—Dosing mechanisms, i.e. setting a dose
- A61M5/31535—Means improving security or handling thereof, e.g. blocking means, means preventing insufficient dosing, means allowing correction of overset dose
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
- A61M5/00—Devices for bringing media into the body in a subcutaneous, intra-vascular or intramuscular way; Accessories therefor, e.g. filling or cleaning devices, arm-rests
- A61M5/178—Syringes
- A61M5/31—Details
- A61M5/315—Pistons; Piston-rods; Guiding, blocking or restricting the movement of the rod or piston; Appliances on the rod for facilitating dosing ; Dosing mechanisms
- A61M5/31533—Dosing mechanisms, i.e. setting a dose
- A61M5/31545—Setting modes for dosing
- A61M5/31548—Mechanically operated dose setting member
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
- A61M5/00—Devices for bringing media into the body in a subcutaneous, intra-vascular or intramuscular way; Accessories therefor, e.g. filling or cleaning devices, arm-rests
- A61M5/178—Syringes
- A61M5/31—Details
- A61M5/315—Pistons; Piston-rods; Guiding, blocking or restricting the movement of the rod or piston; Appliances on the rod for facilitating dosing ; Dosing mechanisms
- A61M5/31533—Dosing mechanisms, i.e. setting a dose
- A61M5/31545—Setting modes for dosing
- A61M5/31548—Mechanically operated dose setting member
- A61M5/31561—Mechanically operated dose setting member using freely adjustable volume steps
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
- A61M5/00—Devices for bringing media into the body in a subcutaneous, intra-vascular or intramuscular way; Accessories therefor, e.g. filling or cleaning devices, arm-rests
- A61M5/178—Syringes
- A61M5/31—Details
- A61M5/32—Needles; Details of needles pertaining to their connection with syringe or hub; Accessories for bringing the needle into, or holding the needle on, the body; Devices for protection of needles
- A61M5/34—Constructions for connecting the needle, e.g. to syringe nozzle or needle hub
- A61M5/347—Constructions for connecting the needle, e.g. to syringe nozzle or needle hub rotatable, e.g. bayonet or screw
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
- A61M5/00—Devices for bringing media into the body in a subcutaneous, intra-vascular or intramuscular way; Accessories therefor, e.g. filling or cleaning devices, arm-rests
- A61M5/178—Syringes
- A61M5/31—Details
- A61M5/32—Needles; Details of needles pertaining to their connection with syringe or hub; Accessories for bringing the needle into, or holding the needle on, the body; Devices for protection of needles
- A61M5/34—Constructions for connecting the needle, e.g. to syringe nozzle or needle hub
- A61M5/348—Constructions for connecting the needle, e.g. to syringe nozzle or needle hub snap lock, i.e. upon axial displacement of needle assembly
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T29/00—Metal working
- Y10T29/49—Method of mechanical manufacture
- Y10T29/49826—Assembling or joining
Definitions
- the present application is generally directed to dose setting mechanisms for drug delivery devices. More particularly, the present application is generally directed to a dose setting mechanisms comprising an inner housing and a dial sleeve and used for drug delivery devices. Aspects of the invention may be equally applicable in other scenarios as well.
- Pen type drug delivery devices have application where regular injection by persons without formal medical training occurs. This may be increasingly common among patients having diabetes where self-treatment enables such patients to conduct effective management of their disease.
- a pen type delivery device There are basically two types of pen type delivery devices: resettable devices (i.e., reusable) and non-resettable (i.e., disposable). These types of pen delivery devices (so named because they often resemble an enlarged fountain pen) are generally comprised of three primary elements: (i) a cartridge section that includes a cartridge often contained within a housing or holder; (ii) a needle assembly connected to one end of the cartridge section; and (iii) a dosing section connected to the other end of the cartridge section.
- resettable devices i.e., reusable
- non-resettable i.e., disposable
- These types of pen delivery devices are generally comprised of three primary elements: (i) a cartridge section that includes a cartridge often contained within a housing or holder; (ii) a needle assembly connected to one end of the cartridge section; and (iii) a dosing section connected to the other end of the cartridge section.
- a cartridge typically includes a reservoir that is filled with a medication (e.g., insulin), a movable rubber type bung or stopper located at one end of the cartridge reservoir, and a top having a pierceable rubber seal located at the other, often necked-down, end.
- a medication e.g., insulin
- a movable rubber type bung or stopper located at one end of the cartridge reservoir
- a top having a pierceable rubber seal located at the other, often necked-down, end.
- a crimped annular metal band is typically used to hold the rubber seal in place.
- the cartridge housing may be typically made of plastic
- cartridge reservoirs have historically been made of glass.
- the needle assembly is typically a replaceable double-ended needle assembly. Before an injection, a replaceable double-ended needle assembly is attached to one end of the cartridge assembly, a dose is set, and then a dose is administered. Such removable needle assemblies may be threaded onto, or pushed (i.e., snapped) onto the pierceable seal end of the cartridge assembly.
- the dosing section or dose setting mechanism is typically the portion of the pen device that is used to set a dose.
- a spindle contained within the dose setting mechanism presses against the bung or stopper of the cartridge. This force causes the medication contained within the cartridge to be injected through an attached needle assembly. After an injection, as generally recommended by most drug delivery device and/or needle assembly manufacturers and suppliers, the needle assembly is removed and discarded.
- a dose setting mechanism for a drug delivery device comprises an inner housing having a helical groove along an external surface of the inner housing and a dial sleeve rotatably engaged with the helical groove of the inner housing.
- the inner housing comprises a first rotational stop member near one end of the helical groove.
- the dose dial sleeve may include an inner surface having a helical groove and a second rotational stop member. The first rotational stop member may mate with the second rotational stop member when a user attempts to select a dose greater than the pre-defined maximum selectable dose.
- a method of assembling a drug delivery dose setting mechanism includes establishing a helical groove along an outer surface of an inner housing.
- the method further includes defining at least one rotational stop feature near one end of the helical groove.
- the rotational stop feature may reside along the outer surface of the inner housing.
- the method further includes assembling a dial sleeve over the inner housing by rotating the dial sleeve with respect to the inner housing, where the dial sleeve is in a threaded engagement with the helical groove on the inner housing.
- FIG. 1 illustrates an embodiment of a drug delivery device
- FIG. 2 illustrates a sectional view of the embodiment of the drug delivery device illustrated in FIG. 1 ;
- FIG. 3 illustrates a partial view of an embodiment of an inner housing of the drug delivery device illustrated in FIG. 1 ;
- FIG. 4 illustrates an embodiment of a dial sleeve of the drug delivery device illustrated in FIG. 1 ;
- FIG. 5 illustrates a half sectional view of the dial sleeve illustrated in FIG. 4 ;
- FIG. 6 illustrates the inner housing of FIG. 3 engaged with the dial sleeve of FIGS. 4-5 .
- the drug delivery device 1 comprises a housing having a first cartridge retaining part 2 , and dose setting mechanism 4 .
- a first end of the cartridge retaining means 2 and a second end of the dose setting mechanism 4 are secured together by retaining features.
- the cartridge retaining means 2 is secured within the second end of the dose setting mechanism 4 .
- a removable cap 3 is releasably retained over a second end or distal end of a cartridge retaining part.
- the dose setting mechanism 4 comprises a dose dial grip 12 and a window or lens 14 .
- a user rotates the dose dial grip 12 and the window allows a user to view the dialed dose by way of a dose scale arrangement 16 .
- FIG. 2 illustrates the medical delivery device 1 of FIG. 1 with the cover 3 removed from the distal end of the medical delivery device.
- a cartridge 20 from which a number of doses of a medicinal product may be dispensed is provided in the cartridge housing 6 .
- the cartridge 20 contains a type of medicament that must be administered often, such as once or more times a day. Once such medicament is insulin.
- a bung or stopper (not illustrated in FIG. 2 ) is retained in a first end or a proximal end of the cartridge 20 .
- the dose setting mechanism 4 of the drug delivery device illustrated in FIG. 2 may be utilized as a reusable (and hence resettable) or a non-reusable (and hence non-resettable) drug delivery device.
- the cartridge is removable from the cartridge housing 6 .
- the cartridge 20 may be removed from the device without destroying the device but merely by the user disconnecting the dose setting mechanism 4 from the cartridge holder 20 .
- a user can attach a suitable needle assembly to the distal end of the cartridge holder.
- a suitable needle assembly may be screwed onto a distal end of the housing or alternatively may be snapped onto this distal end.
- a replaceable cap 3 is used to cover the cartridge holder 6 extending from the dose setting mechanism 4 .
- the outer dimensions of the replaceable cap 3 are similar or identical to the outer dimensions of the dose setting mechanism 4 so as to provide an impression of a unitary whole when the replaceable cap 3 is in position covering the cartridge holder 2 .
- a dose dial grip 12 is disposed about an outer surface of the second end of the dial sleeve 10 , which may be a number sleeve.
- An outer diameter of the dose dial grip 12 preferably corresponds to the outer diameter of the outer housing 40 .
- the dose dial grip 12 is secured to the dial sleeve 10 to prevent relative movement between these two components.
- the dose dial grip 12 and number sleeve 10 comprise a one piece component that is rotationally coupled to a clutch and drive sleeve and axially coupled to the number sleeve 10 .
- alternative coupling arrangements may also be used.
- the operation of the dose setting mechanism 4 generally occurs as follows.
- a user rotates the dose dial grip 12 .
- a user may rotate the dose dial grip towards the user to set a dose.
- a user may rotate the dose dial grip away from the user to set a dose.
- a driver, clutch and the dial sleeve 10 rotate along with the dose dial grip 12 .
- the dial sleeve 10 extends in a proximal direction away from the housing 40 . In this manner, the driver climbs a spindle.
- the dial sleeve 10 may extend in a proximal direction away from the housing until a user sets a maximum selectable dose.
- FIG. 2 illustrates the medical delivery device after a desired dose of 79 International Units (IU) has been dialed.
- IU International Units
- the user may then dispense the desired dose of 79 IU by depressing the button 5 .
- the button 5 As the user depresses the button 5 , this displaces the clutch axially with respect to the dial sleeve 10 , causing the clutch to disengage.
- the dial sleeve 10 and associated dose dial grip 12 are now free to rotate.
- the driver is prevented from rotating with respect to the main housing 40 but it is free to move axially with respect thereto.
- the longitudinal axial movement of the driver causes the spindle to rotate and thereby to advance a piston in the cartridge 20 .
- the dose setting mechanism in accordance with embodiments prevents a user from selecting a dose greater than a pre-defined maximum selectable dose. Components of the dose setting mechanism in accordance with embodiments are described in greater detail with reference to FIGS. 3-6 .
- FIG. 3 illustrates a partial view of an inner housing 300 of the dose setting mechanism 4 .
- the inner housing 300 has a helical groove 302 along the external surface 304 of the inner housing.
- the helical groove 302 is preferably a male helical groove.
- the helical groove 302 may be a female groove or some other equivalent groove structure.
- the inner housing 300 also includes a rotational stop member 306 near one end of the helical groove 302 .
- the helical groove comprises a proximal end 308 and a distal end 310 .
- the rotational stop member 306 is located near the proximal end 308 of the helical groove 302 .
- the rotational stop member 306 may be molded on a flexible arm. Molding the rotational stop member 306 on a flexible arm may aid in the assembly of the dose setting mechanism, which is described in more detail below.
- FIG. 4 illustrates the dial sleeve 10 of the dose setting mechanism 4 .
- the dial sleeve 10 is a number sleeve. As is known in the art, the number sleeve may operate to indicate to the user the amount of dose dialed.
- the dial sleeve 10 is assembled over the inner housing 300 .
- the dial sleeve 10 is capable of rotatably engaging with the helical groove 302 of the inner housing 300 .
- the dial sleeve 10 includes a helical groove 402 on the internal surface 404 of the dial sleeve.
- the dial sleeve 10 further includes a rotational stop member 406 .
- the inner housing 300 also includes a guide lug 312 on the external surface.
- the guide lug 312 may constrain the helical thread form on the dial sleeve 10 .
- helical groove 402 may engage with the helical groove 302 and the guide lug 312 of the inner housing 300 .
- the first rotational stop member 306 prevents the user from selecting a dose greater than a pre-defined selectable dose, such as a pre-defined maximum selectable dose.
- a pre-defined selectable dose such as a pre-defined maximum selectable dose.
- the first rotational stop member 306 of the inner housing may mate or engage with the second rotational stop member 406 of the dial sleeve 10 when a user attempts to select a dose greater than the pre-defined maximum selectable dose.
- Rotational stop members 306 and 406 may have complementary undercuts that strengthen the engagement between the two features.
- the pre-determined maximum selectable dose may be, for example, 80 units. Other pre-defined maximum selectable doses are possible as well.
- the rotational stop feature 406 may be on a flexible arm 408 .
- the flexible arm 408 allows the dial sleeve 10 to be easily assembled over the inner housing 300 , and this assembly is discussed in greater detail below.
- the dial sleeve 10 may also comprise clutch features 412 on the internal surface 404 .
- the internal clutch features 412 restrict the design options for de-molding the part.
- the clutch features 412 can engage similar features on a drive sleeve so that the number sleeve and drive sleeve rotate together when setting a dose.
- the clutch features 412 disengage when dispensing a dose so as to allow relative rotation. It is advantageous if the groove form 402 on the inner surface 404 of the number sleeve 10 can be molded with an axially moving core pin so as to simplify the mold tool actuation.
- the inner groove form 402 comprises less than one turn and the rotational stop feature 406 is molded as a rib extending proximally from one end of the groove form 402 with the an equivalent internal diameter to this groove form.
- the dose dial sleeve 10 can run in the groove between the helical groove 302 on the inner housing.
- the presence of the internal clutch features 412 prevents a core pin from extending proximally out of the part. Consequently, the internal surfaces distal to these clutch features have to be molded with a rotating core pin extending distally from the part.
- the dose setting mechanism 4 may also comprise an outer housing 40 that may house the inner housing 300 and the dial sleeve 10 when the dose setting mechanism is assembled.
- the outer housing 40 preferably has an internal diameter that is equal to or substantially equal to the outer diameter of the dial sleeve 10 . Therefore, when the dose setting mechanism is assembled, the outer housing 40 has an internal diameter which defines a clearance fit to the outside diameter of the dial sleeve 10 . This clearance fit prevents the flexible rotational stop member 406 on the dial sleeve 10 from disengaging from the rotational stop member 306 on the inner housing when the user attempts to dial beyond the maximum dose stop.
- FIG. 6 depicts how an exemplary outer housing 600 prevents disengagement of the rotational stop features 306 and 406 .
- the rotational stop member 306 engages with the rotational stop member 406 when a user dials the maximum selectable dose. Due to this engagement, the user is prevented from dialing a dose greater than the maximum selectable dose.
- the flexible arm 408 rotates out and contacts the inside surface of the outer housing 600 at point 602 , which prevents disengagement from the inner housing stop feature 406 . Without the outer housing 600 contacting the rotational stop member 406 , the rotational stop member 406 could disengage from rotational stop member 306 under heavy load.
- the dial sleeve 10 may be assembled over the inner housing 300 by rotating the dial sleeve 10 with respect to the inner housing 300 .
- the dial sleeve 10 preferably includes a helical groove 402 that is capable of engaging with the helical groove 302 of the inner housing 300 .
- a rotational stop feature 406 may be provided along the inner surface 404 of the dial sleeve 10 , as described above.
- the dial sleeve 10 may be assembled over the inner housing 300 , following a helical path during assembly while engaging with the external thread (i.e., the helical groove) on the inner housing. Due to rotational stop member 406 being disposed on the flexible arm 408 and/or rotational stop member 306 being disposed on a flexible arm, the rotational stop features 306 and 406 may pass over one another during assembly. The rotational stop members 306 and 406 may snap over each other during assembly of the dial sleeve over the inner housing. This snapping may occur due to the flexibility of the flexible arm 408 or the flexibility of the rotational stop member 306 (or both) and the absence of the outer housing 600 .
- the design of the flexible arms does not allow the rotational stops 306 and 406 to pass over one another when a user dials a dose. Rather, when a user tries to rotate the dial sleeve 10 back out along the helical path 302 by more than the pre-defined maximum selectable dose, the rotational stop members engage one another.
- the rotational stop members 306 and 406 may be further prevented from disengagement when the outer housing 600 is assembled over the dial sleeve 10 .
- the outer housing 600 may be provided over the inner housing 300 and the dial sleeve 10 .
- the outer housing has an internal diameter, and, when the outer housing 600 is provided over the dial sleeve 10 , this internal diameter may be utilized to prevent the rotational stop features of the dose dial sleeve from disengaging the rotational stop features of the inner housing.
- the dose setting mechanism is preferably coupled to a cartridge holder, as depicted in FIGS. 1 and 2 .
- the dose setting mechanism may be permanently coupled to the cartridge holder.
- the inner housing 300 enables the dial sleeve 10 to be provided with a helical groove on an inner surface 404 of the dial sleeve 10 , rather than providing such a helical groove on an external surface 410 of the dial sleeve 10 .
- Providing such an internal groove results in a number of advantages. For example, this results in the advantage of providing more surface area along the outer surface 410 of dial sleeve 10 so as to provide the scale arrangement 420 . More number dial surface area may be used for drug or device identification purposes.
- the inner housing 200 also enables the number sleeve 10 to be provided with a helical groove on an inner surface 404 of the number sleeve 10 , rather than providing such a helical groove on an external surface of the number sleeve.
- Providing such an internal groove results in a number of advantages. For example, this results in the advantage of providing more surface area along the outer surface 410 of number sleeve 10 so as to provide the scale arrangement 420 . More number sleeve surface area may be used for drug or device identification purposes.
- Another advantage of providing the helical groove 402 on the inner surface 404 of the drive sleeve is that this inner groove 402 is now protected from dirt ingress.
- the outer surface 410 may be a generally smooth outer surface.
- the dose setting mechanism 4 results in certain manufacturing advantages as well.
- the dial sleeve 10 may be molded as a single component.
- the design of the dial sleeve 10 in accordance with embodiments allows the dial sleeve to be molded as a single component. Molding the dial sleeve as a single component may beneficially lower manufacturing and/or assembly costs.
- the dose setting mechanism 4 has a reduced number of components over other known dose setting mechanisms
- the dial sleeve 10 is a single component having the clutch features 412 , the inner groove mating with the outer groove on the inner housing and the maximum dose stop features acting between these two parts.
Abstract
Description
- 1. Field of the Present Patent Application
- The present application is generally directed to dose setting mechanisms for drug delivery devices. More particularly, the present application is generally directed to a dose setting mechanisms comprising an inner housing and a dial sleeve and used for drug delivery devices. Aspects of the invention may be equally applicable in other scenarios as well.
- 2. Background
- Pen type drug delivery devices have application where regular injection by persons without formal medical training occurs. This may be increasingly common among patients having diabetes where self-treatment enables such patients to conduct effective management of their disease.
- There are basically two types of pen type delivery devices: resettable devices (i.e., reusable) and non-resettable (i.e., disposable). These types of pen delivery devices (so named because they often resemble an enlarged fountain pen) are generally comprised of three primary elements: (i) a cartridge section that includes a cartridge often contained within a housing or holder; (ii) a needle assembly connected to one end of the cartridge section; and (iii) a dosing section connected to the other end of the cartridge section. A cartridge (often referred to as an ampoule) typically includes a reservoir that is filled with a medication (e.g., insulin), a movable rubber type bung or stopper located at one end of the cartridge reservoir, and a top having a pierceable rubber seal located at the other, often necked-down, end. A crimped annular metal band is typically used to hold the rubber seal in place. While the cartridge housing may be typically made of plastic, cartridge reservoirs have historically been made of glass.
- The needle assembly is typically a replaceable double-ended needle assembly. Before an injection, a replaceable double-ended needle assembly is attached to one end of the cartridge assembly, a dose is set, and then a dose is administered. Such removable needle assemblies may be threaded onto, or pushed (i.e., snapped) onto the pierceable seal end of the cartridge assembly.
- The dosing section or dose setting mechanism is typically the portion of the pen device that is used to set a dose. During an injection, a spindle contained within the dose setting mechanism presses against the bung or stopper of the cartridge. This force causes the medication contained within the cartridge to be injected through an attached needle assembly. After an injection, as generally recommended by most drug delivery device and/or needle assembly manufacturers and suppliers, the needle assembly is removed and discarded.
- According to an exemplary arrangement, a dose setting mechanism for a drug delivery device comprises an inner housing having a helical groove along an external surface of the inner housing and a dial sleeve rotatably engaged with the helical groove of the inner housing. The inner housing comprises a first rotational stop member near one end of the helical groove. When a user rotates the dial sleeve to select a dose, the first rotational stop member prevents the user from selecting a dose greater than a pre-defined maximum selectable dose. The dose dial sleeve may include an inner surface having a helical groove and a second rotational stop member. The first rotational stop member may mate with the second rotational stop member when a user attempts to select a dose greater than the pre-defined maximum selectable dose.
- A method of assembling a drug delivery dose setting mechanism is also provided. According to an exemplary arrangement, the method includes establishing a helical groove along an outer surface of an inner housing. The method further includes defining at least one rotational stop feature near one end of the helical groove. The rotational stop feature may reside along the outer surface of the inner housing. The method further includes assembling a dial sleeve over the inner housing by rotating the dial sleeve with respect to the inner housing, where the dial sleeve is in a threaded engagement with the helical groove on the inner housing.
- These as well as other advantages of various aspects of the present invention will become apparent to those of ordinary skill in the art by reading the following detailed description, with appropriate reference to the accompanying drawings.
- Exemplary embodiments are described herein with reference to the drawings, in which:
-
FIG. 1 illustrates an embodiment of a drug delivery device; -
FIG. 2 illustrates a sectional view of the embodiment of the drug delivery device illustrated inFIG. 1 ; -
FIG. 3 illustrates a partial view of an embodiment of an inner housing of the drug delivery device illustrated inFIG. 1 ; -
FIG. 4 illustrates an embodiment of a dial sleeve of the drug delivery device illustrated inFIG. 1 ; -
FIG. 5 illustrates a half sectional view of the dial sleeve illustrated inFIG. 4 ; and -
FIG. 6 illustrates the inner housing ofFIG. 3 engaged with the dial sleeve ofFIGS. 4-5 . - Referring to
FIG. 1 , there is shown a drug delivery device 1 in accordance with a first arrangement of the present invention. The drug delivery device 1 comprises a housing having a firstcartridge retaining part 2, and dose setting mechanism 4. A first end of the cartridge retaining means 2 and a second end of the dose setting mechanism 4 are secured together by retaining features. In this illustrated arrangement, the cartridge retaining means 2 is secured within the second end of the dose setting mechanism 4. Aremovable cap 3 is releasably retained over a second end or distal end of a cartridge retaining part. As will be described in greater detail, the dose setting mechanism 4 comprises adose dial grip 12 and a window orlens 14. - To set a dose of medication contained within the drug delivery device 1, a user rotates the
dose dial grip 12 and the window allows a user to view the dialed dose by way of adose scale arrangement 16. -
FIG. 2 illustrates the medical delivery device 1 ofFIG. 1 with thecover 3 removed from the distal end of the medical delivery device. As illustrated, acartridge 20 from which a number of doses of a medicinal product may be dispensed is provided in the cartridge housing 6. Preferably, thecartridge 20 contains a type of medicament that must be administered often, such as once or more times a day. Once such medicament is insulin. A bung or stopper (not illustrated inFIG. 2 ) is retained in a first end or a proximal end of thecartridge 20. - The dose setting mechanism 4 of the drug delivery device illustrated in
FIG. 2 may be utilized as a reusable (and hence resettable) or a non-reusable (and hence non-resettable) drug delivery device. Where the drug delivery device 1 comprises a reusable drug delivery device, the cartridge is removable from the cartridge housing 6. Thecartridge 20 may be removed from the device without destroying the device but merely by the user disconnecting the dose setting mechanism 4 from thecartridge holder 20. - In use, once the
removable cap 3 is removed, a user can attach a suitable needle assembly to the distal end of the cartridge holder. Such needle unit may be screwed onto a distal end of the housing or alternatively may be snapped onto this distal end. Areplaceable cap 3 is used to cover the cartridge holder 6 extending from the dose setting mechanism 4. Preferably, the outer dimensions of thereplaceable cap 3 are similar or identical to the outer dimensions of the dose setting mechanism 4 so as to provide an impression of a unitary whole when thereplaceable cap 3 is in position covering thecartridge holder 2. - Returning to
FIGS. 1-2 , adose dial grip 12 is disposed about an outer surface of the second end of thedial sleeve 10, which may be a number sleeve. An outer diameter of thedose dial grip 12 preferably corresponds to the outer diameter of theouter housing 40. Thedose dial grip 12 is secured to thedial sleeve 10 to prevent relative movement between these two components. In one preferred arrangement, thedose dial grip 12 andnumber sleeve 10 comprise a one piece component that is rotationally coupled to a clutch and drive sleeve and axially coupled to thenumber sleeve 10. However, alternative coupling arrangements may also be used. - In normal use, the operation of the dose setting mechanism 4 generally occurs as follows. To dial a dose in the arrangement illustrated in
FIGS. 1-2 , a user rotates thedose dial grip 12. A user may rotate the dose dial grip towards the user to set a dose. Alternatively, a user may rotate the dose dial grip away from the user to set a dose. A driver, clutch and thedial sleeve 10 rotate along with thedose dial grip 12. Thedial sleeve 10 extends in a proximal direction away from thehousing 40. In this manner, the driver climbs a spindle. Thedial sleeve 10 may extend in a proximal direction away from the housing until a user sets a maximum selectable dose.FIG. 2 illustrates the medical delivery device after a desired dose of 79 International Units (IU) has been dialed. When this desired dose has been dialed, the user may then dispense the desired dose of 79 IU by depressing the button 5. As the user depresses the button 5, this displaces the clutch axially with respect to thedial sleeve 10, causing the clutch to disengage. However the clutch remains keyed in rotation to the driver. Thedial sleeve 10 and associateddose dial grip 12 are now free to rotate. The driver is prevented from rotating with respect to themain housing 40 but it is free to move axially with respect thereto. The longitudinal axial movement of the driver causes the spindle to rotate and thereby to advance a piston in thecartridge 20. The dose setting mechanism in accordance with embodiments prevents a user from selecting a dose greater than a pre-defined maximum selectable dose. Components of the dose setting mechanism in accordance with embodiments are described in greater detail with reference toFIGS. 3-6 . -
FIG. 3 illustrates a partial view of aninner housing 300 of the dose setting mechanism 4. As depicted, theinner housing 300 has ahelical groove 302 along theexternal surface 304 of the inner housing. Thehelical groove 302 is preferably a male helical groove. Alternatively, thehelical groove 302 may be a female groove or some other equivalent groove structure. - The
inner housing 300 also includes arotational stop member 306 near one end of thehelical groove 302. The helical groove comprises aproximal end 308 and adistal end 310. Preferably, therotational stop member 306 is located near theproximal end 308 of thehelical groove 302. Alternatively, therotational stop member 306 may be molded on a flexible arm. Molding therotational stop member 306 on a flexible arm may aid in the assembly of the dose setting mechanism, which is described in more detail below. -
FIG. 4 illustrates thedial sleeve 10 of the dose setting mechanism 4. As shown, thedial sleeve 10 is a number sleeve. As is known in the art, the number sleeve may operate to indicate to the user the amount of dose dialed. When the dose setting mechanism is assembled, thedial sleeve 10 is assembled over theinner housing 300. Thedial sleeve 10 is capable of rotatably engaging with thehelical groove 302 of theinner housing 300. As depicted inFIG. 5 , thedial sleeve 10 includes ahelical groove 402 on theinternal surface 404 of the dial sleeve. Thedial sleeve 10 further includes arotational stop member 406. - In an exemplary arrangement, the
inner housing 300 also includes aguide lug 312 on the external surface. Preferably, theguide lug 312 may constrain the helical thread form on thedial sleeve 10. When thedial sleeve 10 is disposed over theinner housing 300,helical groove 402 may engage with thehelical groove 302 and theguide lug 312 of theinner housing 300. - When a user of the drug delivery device rotates the dose dial grip of the dose setting mechanism, the first
rotational stop member 306 prevents the user from selecting a dose greater than a pre-defined selectable dose, such as a pre-defined maximum selectable dose. Specifically, the firstrotational stop member 306 of the inner housing may mate or engage with the secondrotational stop member 406 of thedial sleeve 10 when a user attempts to select a dose greater than the pre-defined maximum selectable dose.Rotational stop members - The
rotational stop feature 406 may be on aflexible arm 408. Theflexible arm 408 allows thedial sleeve 10 to be easily assembled over theinner housing 300, and this assembly is discussed in greater detail below. - In an exemplary arrangement, the
dial sleeve 10 may also compriseclutch features 412 on theinternal surface 404. The internal clutch features 412 restrict the design options for de-molding the part. As an example, the clutch features 412 can engage similar features on a drive sleeve so that the number sleeve and drive sleeve rotate together when setting a dose. However, the clutch features 412 disengage when dispensing a dose so as to allow relative rotation. It is advantageous if thegroove form 402 on theinner surface 404 of thenumber sleeve 10 can be molded with an axially moving core pin so as to simplify the mold tool actuation. This can be achieved if theinner groove form 402 comprises less than one turn and therotational stop feature 406 is molded as a rib extending proximally from one end of thegroove form 402 with the an equivalent internal diameter to this groove form. In this manner, thedose dial sleeve 10 can run in the groove between thehelical groove 302 on the inner housing. However, the presence of the internal clutch features 412 prevents a core pin from extending proximally out of the part. Consequently, the internal surfaces distal to these clutch features have to be molded with a rotating core pin extending distally from the part. - The dose setting mechanism 4 may also comprise an
outer housing 40 that may house theinner housing 300 and thedial sleeve 10 when the dose setting mechanism is assembled. Theouter housing 40 preferably has an internal diameter that is equal to or substantially equal to the outer diameter of thedial sleeve 10. Therefore, when the dose setting mechanism is assembled, theouter housing 40 has an internal diameter which defines a clearance fit to the outside diameter of thedial sleeve 10. This clearance fit prevents the flexiblerotational stop member 406 on thedial sleeve 10 from disengaging from therotational stop member 306 on the inner housing when the user attempts to dial beyond the maximum dose stop. -
FIG. 6 depicts how an exemplaryouter housing 600 prevents disengagement of the rotational stop features 306 and 406. As depicted, therotational stop member 306 engages with therotational stop member 406 when a user dials the maximum selectable dose. Due to this engagement, the user is prevented from dialing a dose greater than the maximum selectable dose. Under a load, theflexible arm 408 rotates out and contacts the inside surface of theouter housing 600 atpoint 602, which prevents disengagement from the innerhousing stop feature 406. Without theouter housing 600 contacting therotational stop member 406, therotational stop member 406 could disengage fromrotational stop member 306 under heavy load. The components described in reference toFIGS. 3-6 can be assembled in order to provide a drug delivery dose setting mechanism, such as dose setting mechanism 4. Thedial sleeve 10 may be assembled over theinner housing 300 by rotating thedial sleeve 10 with respect to theinner housing 300. As mentioned above, thedial sleeve 10 preferably includes ahelical groove 402 that is capable of engaging with thehelical groove 302 of theinner housing 300. Further, arotational stop feature 406 may be provided along theinner surface 404 of thedial sleeve 10, as described above. - During the assembly of the dose setting mechanism, the
dial sleeve 10 may be assembled over theinner housing 300, following a helical path during assembly while engaging with the external thread (i.e., the helical groove) on the inner housing. Due torotational stop member 406 being disposed on theflexible arm 408 and/orrotational stop member 306 being disposed on a flexible arm, the rotational stop features 306 and 406 may pass over one another during assembly. Therotational stop members flexible arm 408 or the flexibility of the rotational stop member 306 (or both) and the absence of theouter housing 600. While the flexible arm or arms allowrotational stops rotational stops dial sleeve 10 back out along thehelical path 302 by more than the pre-defined maximum selectable dose, the rotational stop members engage one another. - The
rotational stop members outer housing 600 is assembled over thedial sleeve 10. During the assembly of the dose setting mechanism, theouter housing 600 may be provided over theinner housing 300 and thedial sleeve 10. As mentioned above, the outer housing has an internal diameter, and, when theouter housing 600 is provided over thedial sleeve 10, this internal diameter may be utilized to prevent the rotational stop features of the dose dial sleeve from disengaging the rotational stop features of the inner housing. - In a preferred arrangement, the dose setting mechanism is preferably coupled to a cartridge holder, as depicted in
FIGS. 1 and 2 . The dose setting mechanism may be permanently coupled to the cartridge holder. - (Advantageously, the
inner housing 300 enables thedial sleeve 10 to be provided with a helical groove on aninner surface 404 of thedial sleeve 10, rather than providing such a helical groove on anexternal surface 410 of thedial sleeve 10. Providing such an internal groove results in a number of advantages. For example, this results in the advantage of providing more surface area along theouter surface 410 ofdial sleeve 10 so as to provide thescale arrangement 420. More number dial surface area may be used for drug or device identification purposes. - Having the groove on the inside of the dial sleeve maximizes the area for the dose numbers and minimizes the effective diameter of the groove engagement to the inner housing, thus reducing the risk of this groove interface jamming during dispensing by increasing the effective groove helix angle.
- As described, the inner housing 200 also enables the
number sleeve 10 to be provided with a helical groove on aninner surface 404 of thenumber sleeve 10, rather than providing such a helical groove on an external surface of the number sleeve. Providing such an internal groove results in a number of advantages. For example, this results in the advantage of providing more surface area along theouter surface 410 ofnumber sleeve 10 so as to provide thescale arrangement 420. More number sleeve surface area may be used for drug or device identification purposes. Another advantage of providing thehelical groove 402 on theinner surface 404 of the drive sleeve is that thisinner groove 402 is now protected from dirt ingress. In other words, it is more difficult for dirt to become logged in this inner groove interface than if the groove were provided along theouter surface 410 of thenumber sleeve 10. This feature is particularly important for a re-settable drug delivery device which will have to function over a much longer period of time compared to a non-resettable device. The effective driving diameter (represented by ‘D’) of the grooved interface between thenumber sleeve 10 and the inner housing 200 is reduced compared to certain known drug delivery devices for the same outer body diameter. This improves efficiency and enables the drug delivery device to function with a lower pitch (represented by ‘P’) for this groove and groove guide connection. In other words, as the helix angle of the thread determines whether when pushed axially, the number sleeve will rotate or lock to the inner body wherein this helix angle is proportional to the ratio of P/D. Because thedial sleeve 10 has thehelical groove 402 on theinternal surface 404 of the dial sleeve, theouter surface 410 may be a generally smooth outer surface. - By utilizing the
inner housing 300 and thedial sleeve 10, the dose setting mechanism 4 results in certain manufacturing advantages as well. For example, in one preferred arrangement, thedial sleeve 10 may be molded as a single component. The design of thedial sleeve 10 in accordance with embodiments allows the dial sleeve to be molded as a single component. Molding the dial sleeve as a single component may beneficially lower manufacturing and/or assembly costs. - Another advantage of a dose setting mechanism in accordance with this arrangement is that the dose setting mechanism 4 has a reduced number of components over other known dose setting mechanisms In other words, the
dial sleeve 10 is a single component having the clutch features 412, the inner groove mating with the outer groove on the inner housing and the maximum dose stop features acting between these two parts. - Exemplary embodiments of the present invention have been described. Those skilled in the art will understand, however, that changes and modifications may be made to these embodiments without departing from the true scope and spirit of the present invention, which is defined by the claims.
Claims (22)
Priority Applications (1)
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US12/788,767 US9125994B2 (en) | 2009-06-01 | 2010-05-27 | Drug delivery device with dose dial sleeve rotational stop |
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- 2010-05-28 EP EP10725073.0A patent/EP2437831B1/en active Active
- 2010-05-28 CA CA2762956A patent/CA2762956A1/en not_active Abandoned
- 2010-05-28 WO PCT/EP2010/057489 patent/WO2010139642A1/en active Application Filing
- 2010-05-28 CN CN201080032061.6A patent/CN102458528B/en active Active
- 2010-05-28 HU HUE10725073A patent/HUE038676T2/en unknown
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- 2010-05-28 AU AU2010255817A patent/AU2010255817B2/en not_active Ceased
- 2010-05-28 JP JP2012513571A patent/JP5744013B2/en active Active
- 2010-05-28 US US15/854,131 patent/USRE48185E1/en active Active
- 2010-05-28 DK DK10725073.0T patent/DK2437831T3/en active
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Also Published As
Publication number | Publication date |
---|---|
AU2010255817B2 (en) | 2014-12-11 |
IL216501A (en) | 2014-06-30 |
JP5744013B2 (en) | 2015-07-01 |
AU2010255817A1 (en) | 2011-12-22 |
BRPI1011724A2 (en) | 2016-03-22 |
CN102458528B (en) | 2014-09-10 |
US9125994B2 (en) | 2015-09-08 |
DK2437831T3 (en) | 2018-06-25 |
EP2437831B1 (en) | 2018-03-14 |
USRE48185E1 (en) | 2020-09-01 |
ES2673512T3 (en) | 2018-06-22 |
WO2010139642A1 (en) | 2010-12-09 |
TR201808480T4 (en) | 2018-07-23 |
CN102458528A (en) | 2012-05-16 |
HUE038676T2 (en) | 2018-11-28 |
US9399099B2 (en) | 2016-07-26 |
IL216501A0 (en) | 2012-03-01 |
CA2762956A1 (en) | 2010-12-09 |
US20120165748A1 (en) | 2012-06-28 |
PL2437831T3 (en) | 2018-09-28 |
JP2012528630A (en) | 2012-11-15 |
EP2437831A1 (en) | 2012-04-11 |
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